Uruguay 1952 Death Centenary of General Artigas 10c Flag Printer's sample with grey background (issued stamp was red-brown) overprinted Waterlow & Sons SPECIMEN with security punch hole without gum, as SG 1016
Uruguay 1952 Death Centenary of General Artigas 10c Flag Printer's sample with grey background (issued stamp was red-brown) overprinted Waterlow & Sons SPECIMEN with security punch hole without gum, as SG 1016